Make CSSValuePool thread local to ensure correct parsing in colors on workers

third_party/WebKit/Source/modules/canvas2d/CanvasStyle.h

 /*
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  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
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 #ifndef CanvasStyle_h
 #define CanvasStyle_h
 
+#include "core/css/CSSValuePool.h"
 #include "platform/graphics/Color.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Assertions.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 class SkPaint;
 class SkShader;
 
 namespace blink {
@@ skipping 26 matching lines @@
     CanvasStyle(CanvasGradient*);
     CanvasStyle(CanvasPattern*);
 
     Type m_type;
     RGBA32 m_rgba;
 
     Member<CanvasGradient> m_gradient;
     Member<CanvasPattern> m_pattern;
 };
 
-bool parseColorOrCurrentColor(Color& parsedColor, const String& colorString, HTMLCanvasElement*);
+bool parseColorOrCurrentColor(Color& parsedColor, const String& colorString, HTMLCanvasElement*, CSSValuePool* localCssValuePool = nullptr);
 
 } // namespace blink
 
 #endif